Cooling arrangement for the valves of internal-combustion engines



March 16 1926.

G. FORNACA COOLING ARRANGEMENT FOR THE VALVES OF INTERNAL COMBUSTION ENGINES Filed March 5 45 shown Patented M'ar. 1 6, 1926.

GUIDO EORNACA, OF TURIN, ITALY.

I COOLING ARRANGEMENT FOR THE VALVES F INTERNAL-COMBUSTION ENGINES.

Application filed March 5, 1925. Serial No. 13,229.

To all whom. it may concern:

Be it known that I. Gumo FORNACA, a subject of the King of Italy, and resident of Turin, in the Kingdom of Italy, have invented certain new and useful Improvements in Cooling Arrangements for the Valves of Intcrnal-Combustion Engines; and I do hereby declare the following to be a full, clear,

invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon,

' form a part of this specification.

This invention relates to internal combustion engines, and its object is to provide improved means for cooling the valves by the circulation thercthrough of oil or other cooling fluid.

In accordance with the present invention, the fluid is fed through the cam shaft and thence through a tube projecting into the hollow valve, said tube being mounted on the cam shaft and having guide fins engaging the inner wall of the hollow valve stem, whereby an annular passage is left between thetube and the stem for the return flow of the fluid.

The invention is illustrated, by way of example, on the accompanying drawings, whereon Fig. 1 is a vertical axial section of a valve and appertaining parts, the valve being closed;

' Fig. 2 is a similar View showing the valve in the open position;

Fig. 3 is a section on the'line A-'-B of Fi 1;

, iigp l is a section on the line U-.D of

Fig. 1.

Referring to the drawing the reference 1 denotes a supply pipe for Oll or other cooling li uid fed by a circulating pump (not i. This pipe communicates with the bore 2 of a hollow cam shaft 3 which has double cams 4, 4 for each valve 9. Between and exact description of the.

which the double cams 4, 4 a radial port 5 is formed in the cam shaft with, if desired, an

annular peripheral distributing groove, and

at this point a head (3 (Fig. 3) carrying a tube 7 is mounted on the shaft. The tube 7 depends into the stem 8 of the hollow valve 9. It is smaller in diameter than the bore of the stem and is provided with guide fins 10.

Oil or other liquid coming from the pipe 1 passes along the bore 2 of the cam shaft 3 to the radial port 5 where it enters thetubc 7 and is conveyed to the interior wall 9 of the valve head and cools the latter; it then passes up between the stem 8 and the small tube 7 discharging on to the valve spring seat 11 whence it overflows into the hollow 12 from which it is taken up again by a pump or other suitable means (not shown) and returned to the valve through a cooler.

' What I claim is:

1-. An arrangement for cooling the valves of internal combustion engines comp-rising a hollow rotary cam shaft, means for supplying a cooling fluid to the interior of the shaft, a valve having a'hollow stem operable by the shaft, a tube mounted on the latter communicating with a fluid discharge aperture in the shaft. and projecting into hollow valve stem, and guide fins on the tube en gaging the inner wall of the valve stem.

2. An arrangement for cooling the valves of internal combustion engines comprising, a hollow rotary shaft, means for supplying a coolin fluid to the interior of the latter, a

valve a-ving a hollow stem, spaced cams on the shaft for actuating the valve stem, :1 head mounted on the shaft between the cams. a tube carried by the head communicating with a fluid discharge aperture formed in the shaft between the cams, said tube projecting into the hollow valve stem and having guide fins formed thereon engaging the inner wall of said stem.

In testimony that I claim the foregoing as my invention, I have signed my name.

GUIDO FORNAGA. 

